Drill press



C'. A. .W|D|VER.

DRILL PRESS. APPLICATION FILED Nov. 13.' |918.

@424553 8 n Patented Aug. l, 1922.

2 SHEETS-susi? L# J9 Mala/e5 Maine/j C. A. WIDNIER.

DRILL PRESS.

APPLICATION FILED Nov. I3. I9IIs.

Patented Aug. Il, )1922.

' A 2 sIIETs-SIIEET 2.

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.fr 47 I Z I 51 5 DRILL rzans's.

applicati@ inea November 13, 191s.

certain new and useful Improvements in Drill Presses, of which the following is a speciication.

Drill presses 'in which the drill spindle is power-driven to perform its thrust-movements are of three known types, to wit; those in which the drill-spindle is powerreciprocated constantly, in which t'he drillspindle is brought down to a certain point manually and then manually thrown into connection with the power drive mechanism,

and iinally those in which the drill-spindle is depressed manually until it contacts with the work, whereby the resulting 'resistance causes the drill-spindle to be coupled with the power-drive mechanism lor "continiiing the downward thrust. The third known type is an improvement on the iirst and secondin that o'n the one hand the movements "of the drill-spindle are subject to 'manual control and on the other require only Ione of the attendants hands to be occupied. My present invention represents a further advance in the art, notably in this, that whereas, as in the third type, the movements of the drill-spindle are subject to manual control and such control involves the occupation of only one of the operators hands, the coupling o'f the drill-spindle with the power drive mechanism is dependant not on contact of the tool with the work but on the drill-spindle iirst moving a 'deiinite distance under manual influence. Thus, in a practical application of my invention, since the coupling occurs entirely without reference to contact 'of the tool with the work and 'the utilization of incidental resistance to ef'- fect it, it may very desirably be adapted te occur just before the whereby the tool comes to the work subject to a constant, power drive eiifort, and the operator is saved the fatigue incident to overcoming resistance in order to effect the coupling, less skill, moreover, being re- 'quired on the operators part, and certain other l'advantages resulting and which will be evident to these skilled in the art.

In the accompanying drawings,

ASper-,ication of Letters Patent.

contact accrues,

lijatented fang. 1, 1932.

serial no. 2624265.

F ig. 1 lis a 'front elevation of -a drillspress embodying my improvements.

Fig. 2 isa fragmentary plan, 'partly in section.

Fig. 3 is ITa fragmentary elevation.

LFig. '4 is a "detail sectional vview.

Fig. 5 is a fragmentary view illustrating the locking paw-l and 'release mechanism.

Similar characters of referemoe designate Correspmding parts throughout the several views.

The `drill-press, in connection with which the invention is herein illustrated, Inlay be ci any well-known or special design, 10 'designating the pillar and 11 and 12 the spaced horizontal head members 'of the frame of the machine, i13 the forward pulley of a =belftandpulley driving means arranged in said head members, 14 the drill-spindle Isplined in the sleeve 15 which affords the journal part of said pulley, 16 the sleeve through which the spindle downwardly projects, being rotative therein but confined against vertical movement relatively thereto by the collars 17 and 17 thereon, 18 the trame arm, adjustable up and down =on the pillar, i'n which sleeve 16 is splined, 19 the work table, 20 the chuck for the tool suitably attached to the lower end of ythe spindle-'- the sleeve, spindle 'and chuck forming an 'up-and-d'own movable tool-carrier'-and 21 a rotary horizontal shaft journal'ed inthe frame-arm 18 and having a pinion 22 (Fig. 4) meshing with r'ack teeth 23 'on the sleeve and a iiX'ed head 24 provided with radial handles 25, the parts 21 and 25 forming means for manually moving the carrier up Vand down. To hold the 'carrier normally elevated, I may provide any suitable andV well-known means (not shown).

In the adaptation herein shown, the construction is such that the carrier, normally held elevated, is adapted to be started on its downward course manually, by turning shaft 21 in the proper direction by means of its described handles and, when it has thus been made to proceed downward a definite distan'ce, to be driven downward by power a definite further distance, thereupon to be released and so return to the elevated position under the influence of the means normally acting te hold it in that position. To this end, there are a going driving means and a powertransmitting coupling to connect the carrier with the driving means and which v will now be described.

A rotary vertical shaft 26 is suitably mounted parallel to theV drill-spindle 14, being driven from the pulleys 27 thereof through belt 23 and pulleys 29 of said shaft.A

Through intermediate mechanism this rotation of shaft 26 is communicated to a further shaft 30 designed to have an actual vertical motion relatively to said shaft 26 and being stepped on an anti-friction bearing 31 as well d as having aiiixed to it a worm 32 and a collar 33, F ig. 3, the step bearing, worm and collar fitting between opposed abutments 34, Fig. 3, in the casing and so confining the shaft against vertical movement relatively to the casing-.H f l Shaft 21 has a reduced extension135 on which is freely revoluble af gear member 36 whichcomprises peripheral worm teeth 37 and peripheral gear teeth 38 (the teeth-37 and 38 vbeing formed in the illustrated constructionas two separate parts keyed togetherat 39). Keyed on the shaft is the hub 40 of a face plate 41 to which there is affixed,

,spaced therefrom by disks 42 and concentric with the shaft, an annular plate or ring 43;

the means for securing-ring 43 to the face plate may be screws 44. On studsl 45, sup- 1 `ported' at their ends by the ring and face plate, are journaledpinions 46, meshing v shaft, as stated. The interior teeth 51 mesh with the pinions 46, and it will'now be obvious that if, assuming the member 36 to be constantly rotated from the work wheel 32 and the member 47 be alternately held against and left free to rotate, shaft 21 will be alternately rotated and non-rotated or idle, respectively; that is, with member 47 held against rotation, theparts 36 and 46 will constitute planetary gearing and so shaft 21 willbe driven through the face plate and with member 47 released, rotation of member 36 will be transmitted to member 47 through the pinions 46 without affecting i f the face plate. For controlling the member .i 47, there is pivoted in the casing 50 on a shaft 54 parallel with shaft 21 a two-armed ypawl 55,4 one arm of which has a hook 56 to engage the ratchet teeth 52 of member 47 if The shifting of the pawl iseffected from the tool carrier in the following( manner.

A collar 58 is secured to the sleeve 16 and `against stop 63 immediately over the protruding arm of lever 55. When the carrier descends, the dog will engage said protruding arm of said lever 55 and shift the position of disengagement of its pawl 56 to one of engagement with the teeth l52 of gear 47 but during the return movement, the dog will be shifted idly on its pivot by said arm, as indicated by dotted lines. On the sleeve 16 there is also arranged a stra or further collar 65 adapted to be adjustef vertically thereon by a clamp screw 66said strap having a toe 67 on its underface which, a predeterminedl time after dog 62 shifts the pawl 56 into positionffor engagement, impinges upon a projection 68 of the arm 69 of a rock shaft 70. This rock shaft carries a double-stepped detent 71 which, in position of engagement of the pawl and teeth shown in `Fig. 5, is designed to engage an arm 72 of the pawl lever 55 to lock the position of engagement; and when the shaft is rocked through engagement of toe 67 with projection 63, arm 72 slips out of enA gagement with the upper step of the `detent and into the lower position, wherein the pawl 56 through the outward movement of its carrying arm 55 becomes released from engagement with the teeth 52. This release may also be effected manually by directly actuating the projeoting -a/rm 69 of rock shaft 70. Pawl 56 is-urged outwardly a limited extent through the action of a spring 73 which yieldinglyretains the said pawl in its carrying arm 55 and the arm 72 is spring-urged toward the detent 71 through a spring 74. The position of the collar 65 is adjusted to suit the degree of lfeed desired, and the dog 62is so positioned that when the drill-spindle descends, the latter will be coupled with the `power drive just before said spindle contacts with the work. v

rThe operation will now'l be obvious to those skilled in the art. The elements 15, 27,

.28, 29, 26, 30,32 and 36 may be regarded as a goingy drivingmeans, the elements 14, 16, 21 and 41 as a tool carrier-including driven means movable back and forth-and the elements 46 and 47 vand pawl 56 as a coupling for operatively connecting the driving and driven means having a moving master member (the pawl) movable to one position to make or establish and to another to break or disestablish the coupling. The carrier is normally held withcollar 17 abutting the frame arm 18. l

When the carrier is elevated, the master member stands in position of disengagement. On the operators turning shat 21 to depress the carrier, the dog 62 at a certain point in the descent of the carrier will trip the master member to lock the gear member 47 against rotation, thus making or establishing the coupling so that the power of the going driving means will be trans mitted to and continue downward the oarrier. The carrier will continue downward, power driven, to a point (predetermined by adjusting up or down collar 65) where toe 67 impinges and trips back the master member, returning the same to the position to release gear member 47, thus breaking or disestablishing the coupling, and, the carrier now being free, returns to the elevated position, the dog 62 wiping idly past the lever 55. The power applied to the tool is thus not only of a constant character while the tool is at work, but is cut off at a denite point.

l claim:

In combination, the frame, a tool-carrierincluding train including a rotary driven member, a rotary driving gear member, a free rotary gear, said members and the gear being concentric, a pinion meshing with the gear and journaled in one and meshing with the other oi' said members, and a rotation preventing detent device for the gear movable into and out of locking relation thereto and actuable by a part of said train. n

Signed at New York, in the county of New York and State of New York, this seventh day of November, A. D. 1918.

CHARLES A. WIDMER. 

